A 23-year-old man from London was fatally stabbed in Welwyn Garden City shortly after a 'serious altercation' between four men, police have said.

The man, who has not been identified, was found on Ludwick Way having suffered stab wounds at around 10.20pm.

Despite the efforts of paramedics and an air ambulance he passed away on the scene.

The Hertfordshire Constabulary revealed today that they believe there was a 'serious altercation' on Ethelred Close before the incident which involved four men.

Detective Chief Inspector Jerome Kent, from the Beds, Cambs and Herts Major Crime Unit, said: “Did you see anything suspicious or out of the ordinary on Thursday evening? We are also trying to identify a 4x4 car that was seen to leave the area shortly after the incident.

Police forensics on the scene of a murder in Welwyn Garden City

“I appeal to anyone who might have witnessed something or who knows anything at all about the incident to get in touch with us as soon as possible.”